SpringBoot和SpringJDBC多个数据源 [英] SpringBoot and SpringJDBC multiple datasources

问题描述

我正在尝试在SpringBoot应用程序中使用两个数据源，但无法将第二个数据源自动连接。我已经尝试了很多东西，但这是我最近来的东西：

I am trying to use two datasources with my SpringBoot application and can't get the second datasource to autowire. I have tried many things but this is the closest I have come:

我的Yaml文件：

spring:
  first-datasource:
    url: MyURLString1
    username: User
    password: Password
    driver-class-name: oracle.jdbc.OracleDriver
  second-datasource:
    url: MyURLString2
    username: User
    password: Password
    driver-class-name: oracle.jdbc.OracleDriver

我的应用程序类：

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.first-datasource")
    public DataSource firstDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.second-datasource")
    public DataSource secondDataSource() {
        return DataSourceBuilder.create().build();
    }
}

最后是我的DAO：

@Repository
public class MyDao {
    private static final String FIRST_SELECT = "select * from SomeTableInDB1";
    private static final String SECOND_SELECT = "select * from AnotherTableInDB2";

    @Autowired
    private JdbcTemplate firstJdbcTemplate;
    @Autowired
    @Qualifier("secondDataSource")
    private JdbcTemplate secondJdbcTemplate;

    List<DB1Entity> getDB1Entity(Long id) {
        return firstJdbcTemplate.query(FIRST_SELECT, new Object[] {id}, new BeanPropertyRowMapper(DB1Entity.class));
    }

    List<DB2Entity> getDB2Entity(Long id) {
        return secondJdbcTemplate.query(SECOND_SELECT, new Object[] {id}, new BeanPropertyRowMapper(DB2Entity.class));
    }
}

这是我到目前为止最接近的。我说这是最接近的，因为如果我删除@Qualifier，那么我的两个dao方法都可以正常工作，假设SECOND_SELECT语句对我的DB1是有效的SQL。一旦为非主要数据源输入@Qualifier，我就会得到一个自动装配错误，因为Spring需要一个Datasouce对象，而不是JdbcTemplate对象。这对我来说很奇怪，因为它可以与主数据源一起使用。

This is the closest I have come so far. I say it is closest because if I remove the @Qualifier then both of my dao methods actually work, assuming that the SECOND_SELECT statement is valid SQL for my DB1. Once I put in the @Qualifier for my non-primary datasouce then I get an autowire error because Spring is expecting a Datasouce object, not a JdbcTemplate object. That is weird to me as it does work with the primary datasource.

这是我的错误：

可以不是自动装配字段：私有org.springframework.jdbc.core.JdbcTemplate org.my.classpath.secondJdbcTemplate;嵌套的异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有找到类型为[org.springframework.jdbc.core.JdbcTemplate]的合格Bean作为依赖项：至少需要1个有资格作为此依赖项自动装配候选的bean。依赖注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true），@ org.springframework.beans.factory.annotation.Qualifier（value = secondDataSource）}

Could not autowire field: private org.springframework.jdbc.core.JdbcTemplate org.my.classpath.secondJdbcTemplate; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=secondDataSource)}

推荐答案

您创建类型为 DataSource 的bean，但是尝试使用 Autowire JdbcTemplate，这是不匹配的。您可能应该有这样的东西

You create the bean of type DataSource, but try to Autowire JdbcTemplate which is a mismatch. Your probably should have something like this

private JdbcTemplate jdbcTemplate1;
private JdbcTemplate jdbcTemplate2;

@Autowired
@Qualifier("firstDataSource")
public void setDataSource(DataSource dataSource){
    this.jdbcTemplate1=new JdbcTemplate(dataSource);
}

@Autowired
@Qualifier("secondDataSource")
public void setDataSource(DataSource dataSource){
    this.jdbcTemplate2=new JdbcTemplate(dataSource);
}

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